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90 Towncar Glowing Manifolds

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Posted by: gs_jim

I have a question ? I have a 1990 Towncar with you know the 320/5.0 engine. The question is what makes the exhaust manifolds glow ? I was thinking the cats but is there a chance that both sides are bad as both sides of the manifolds glow ? Would one side make both glow ? Please let me know...

Posted by: Dereck

Hi Gs Jim

Quote:

Originally Posted by gs_jim

I have a question ? I have a 1990 Towncar with you know the 320/5.0 engine. The question is what makes the exhaust manifolds glow ? I was thinking the cats but is there a chance that both sides are bad as both sides of the manifolds glow ? Would one side make both glow ? Please let me know...

Faulty thermactor system maybe, first job is to whip out the code reader and check for stored fault codes in the PCM.

Regards

Dereck

Posted by: brentalan

That could be indicitive of a lean condition. I would also check your spark plugs for color/damage.

Posted by: gs_jim

The plugs are new. The other i forgot to mention is the car is weak at takeoffs also.

Posted by: gs_jim

Think i got it. Timing was way off and fried plug wires...

Posted by: pepperman

Posted by: CaptainZilog

Rule of thumb:

Manifold/headers glow - lean
Cats glow - rich

Posted by: Bizw0z UK

Quote:

Originally Posted by CaptainZilog

Rule of thumb:

Manifold/headers glow - lean
Cats glow - rich

Nothing glows -yer battery is flat.